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University of Waterloo

1. Wang, Alana Ou. Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments.

Degree: 2020, University of Waterloo

Disposal of mercury (Hg) containing products related to industrial activities has led to large-scale watershed contamination across the globe, posing long-term risks to human health due to its persistent properties. Hg in terrestrial systems can re-enter aquatic systems directly through soil erosion and sediment resuspension, and indirectly through reductive dissolution of manganese (Mn) and iron (Fe) oxides, desorption from clays and other minerals, and breakdown of soil organic matter. Hg is transformed into methylmercury (MeHg), a well-known neurotoxin that accumulates through the food chain, mainly by microbially driven processes under anoxic conditions. Remediation of Hg in riverine environments is challenging due to dynamic redox oscillations caused by flooding and drainage which influence Hg mobility and bioavailability. Mercury sulfate (HgSO4) was used by a textile plant in Waynesboro, VA between 1920-1950s, and as a result of inadvertent discharge elevated Hg concentrations have been observed in the South River watershed since 1970, long after cessation of HgSO4 use. Biochars have been proposed for use in reactive capping mats or as soil amendments for in situ Hg stabilization. Studies evaluating the effectiveness of biochar for stabilizing Hg focus on the effectiveness under fully-saturated conditions, but how treatment systems respond to more environmentally relevant conditions, such as drying and rewetting, is less studied. This dissertation evaluates selected biochars for Hg stabilization in river bank sediments and floodplain soils collected along the South River using laboratory-scale experiments under conditions relevant to riverine environments, including flooding and drainage, fully-saturated anoxic, and drying and rewetting conditions. Five biochars selected for study were: hardwood biochar (OAK), sulfurized-hardwood biochar (MOAK), and biochar prepared from ethanol refinery by-products, including distillers` grains (DIS), anaerobic digestate (DIG), and a mixture of digestate and distillers` grains (75G25S). OAK was evaluated for potential application as a reactive capping mat as well as a soil amendment, and the other biochars were evaluated as soil amendments. To evaluate OAK as a reactive capping mat which intercepts flow paths under flooding and drainage conditions, the treatment system consisted of two sets of modified humidity-cell experiments operated for 100 weekly cycles. The weekly cycles started with dry air, water-saturated air, and were followed by an aqueous leach at day 7 of each week. Each set contained a source column and a treatment column. Source columns contained river bank sediment and floodplain soil collected from different locations along the South River. Treatment columns contained 50% v/v OAK and non-reactive quartz sand. South River water (SRW) was used as input solution for the source column containing river bank sediment, and acidic rain water (ARW) was used as an input solution for the source column containing floodplain soil. Leachates collected from the source…

Subjects/Keywords: remediation; biochar; contaminated soil

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APA (6th Edition):

Wang, A. O. (2020). Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15416

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wang, Alana Ou. “Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments.” 2020. Thesis, University of Waterloo. Accessed January 24, 2020. http://hdl.handle.net/10012/15416.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wang, Alana Ou. “Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments.” 2020. Web. 24 Jan 2020.

Vancouver:

Wang AO. Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2020 Jan 24]. Available from: http://hdl.handle.net/10012/15416.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang AO. Application of Biochar to Stabilize Mercury in Riverbank Sediments and Floodplain Soils from South River, VA under Conditions Relevant to Riverine Environments. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15416

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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